-20.86% is the change from 671 to 531
Calculation steps:
[( 531 - 671 ) ÷ 671] x 100 = -20.86%
Formula
Percentage change = [(531 - 671) / 671] x 100
Subtract the new number by the original number
531 - 671 = -140
-140 ÷ 671 = -0.20864381520119224
-0.20864381520119224 x 100 = -20.86%